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Microchip Technology U2793B-NFSG3H 19
- Part No.:
- U2793B-NFSG3H 19
- Manufacturer:
- Microchip Technology
- Category:
- RF Modulators
- Package:
- 20-LSSOP (0.173", 4.40mm Width)
- Datasheet:
-
U2793B-NFSG3H 19.pdf
- Description:
- RF MODULATOR 20LSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,957
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Product details
Overview
U2793B-NFSG3H from Atmel is a 300-MHz quadrature modulator IC designed for digital radio up-conversion, featuring single-ended 50-Ω RF/LO ports, 90° phase-control loop, duty-cycle regeneration, and low-power 15 mA operation at 5 V. It supports LO frequencies from 30 MHz to 300 MHz and delivers ≥45 dB LO suppression and ≥45 dB sideband suppression in GSM, PCN, JDC, and WLAN systems.
For engineers reviewing the U2793B-NFSG3H datasheet, U2793B-NFSG3H pinout, U2793B-NFSG3H application, or U2793B-NFSG3H equivalent, key selection criteria include its adjustment-free I/Q modulation architecture, spurious performance tunability via pins 19/20, power-down mode, and SSO20 package compatibility with high-density RF layouts.
Technical Context
The U2793B-NFSG3H integrates a frequency doubler, duty-cycle regenerator, and precision 90° control loop to enable accurate quadrature modulation without external calibration. Its baseband inputs accept differential signals up to 1.5 Vpp across 0–50 MHz, while the LO path accepts -15 dBm single-ended input with 50 Ω impedance (50 Ω + 15 pF).
It operates from 4.5 V to 5.5 V over -40°C to +85°C ambient, with reference voltage (2.5 V ±125 mV) on pin 13 and dual low-pass/power-control terminals (pins 19/20) enabling output level and spurious optimization-especially critical for low-frequency LO operation below 100 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LO Frequency Range | 30 MHz to 300 MHz - enables direct synthesis for GSM/PCN/JDC bands without IF staging |
| Supply Current | 15 mA at 5 V - reduces thermal load and simplifies power rail design in portable radios |
| LO Suppression | ≥45 dB typical - minimizes carrier feedthrough in zero-IF transmitters |
| Sideband Suppression | ≥45 dB typical - ensures clean spectral mask compliance in narrowband digital standards |
| Phase Error | <1° - maintains EVM integrity in QPSK/16-QAM modulation schemes |
| Amplitude Error | <±0.25 dB - preserves constellation symmetry and adjacent channel power ratio (ACPR) |
| Output Power | -3 to +2 dBm - drives next-stage mixer (e.g., U2795B) without external amplification |
Pinout & Package
U2793B-NFSG3H uses a 20-pin SSO20 (Shrink Small Outline) package with exposed pad for thermal dissipation. Pin layout supports compact RF routing: dual ground banks (pins 3,16–18), dedicated AC grounds (pins 2,5), and symmetrical baseband I/Q pairs (pins 9/10 and 11/12).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PU (1) | Power-up control | Active-high enable; ≤0.5 V disables device, drawing only 1 µA quiescent current |
| BBAI / BBAIinv (9,10) | Differential baseband A input | Accepts 1.0 Vpp differential signal; 30 kΩ input impedance simplifies AC-coupling network design |
| BBBI / BBBIinv (11,12) | Differential baseband B input | Matches BBAI path for balanced I/Q drive; common-mode voltage fixed at 2.5 V |
| LOI / LOIinv (14,15) | Differential LO input | LOIinv typically grounded; single-ended drive accepted with -15 dBm minimum |
| RFO (4) | RF output | 50-Ω single-ended output; VSWR ≤2.0 ensures stable matching into 50-Ω PA or filter stage |
| LP1 / LP2 (19,20) | Low-pass/power control | External RC network tunes output level and spurious response-critical for sub-100 MHz LO applications |
Key Features
| Feature | Design Value |
|---|---|
| Adjustment-free quadrature generation | Eliminates manual tuning of phase/amplitude balance, reducing production test time and calibration cost |
| Duty-cycle regeneration of LO input | Compensates for LO waveform distortion, enabling robust operation with non-ideal square-wave LO sources |
| Integrated 90° phase-control loop | Maintains precise quadrature accuracy across temperature and supply variation without external PLL components |
| Power-down mode | Reduces supply current to 1 µA, supporting burst-mode transmission in TDMA-based systems like GSM |
| Spurious performance optimization via LP1/LP2 | Enables targeted improvement of low-frequency spurs (e.g., <50 MHz LO) using discrete RC networks |
Applications
| GSM Baseband Transmitter | WLAN 2.4 GHz Up-converter |
|---|---|
Use Scenario: Direct-conversion transmitter in GSM900/1800 handsets requiring low EVM and tight spectral mask compliance. IC Role / Device Role / Timing Role: Quadrature modulator converting baseband I/Q signals to RF carrier; provides 90° phase shift and LO suppression before PA stage. Use Value: ≥45 dB sideband suppression and <1° phase error ensure <3% RMS EVM at 270.833 kbps GMSK, meeting ETSI EN 301 511. | Use Scenario: First-stage up-converter in IEEE 802.11b/g access points, translating 20–30 MHz IF to 2.4 GHz band via image-reject mixing. IC Role / Device Role / Timing Role: I/Q modulator generating clean RF output for subsequent 2 GHz mixer (e.g., U2795B); handles 50 MHz baseband bandwidth. Use Value: 0–50 MHz baseband input range and -15 dBm LO sensitivity allow integration with low-power IF DACs and crystal-based LO synthesizers. |
| JDC (PHS) Handset Transmitter | PCN (DECT) Cordless System |
Use Scenario: Transmit chain in Japanese PHS handsets operating at 1.9 GHz with 300 kHz channel spacing and π/4-DQPSK modulation. IC Role / Device Role / Timing Role: Final-stage modulator delivering spectrally pure RF output; leverages duty-cycle regeneration to tolerate low-jitter LO sources. Use Value: ≥32 dB LO suppression prevents carrier leakage into adjacent 300 kHz channels, maintaining adjacent channel interference (ACI) below -55 dBc. | Use Scenario: DECT 1.88–1.90 GHz cordless phone base station transmitting 1.152 Mbps GFSK-modulated signals. IC Role / Device Role / Timing Role: Low-power quadrature modulator interfacing with 1.5 Vpp baseband DACs and 188 MHz LO; operates in burst mode with PU-controlled power-down. Use Value: 15 mA supply current and 1 µA power-down current extend base station standby time while meeting ETSI EN 300 175-2 spectral purity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quadrature modulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADL5375-05ACPZ-R7 | Higher LO range (300 MHz–4 GHz), integrated LO buffer, but requires 3.3 V supply and consumes 220 mA | Suitable for wideband LTE/WiMAX up-conversion; not drop-in due to different pinout, biasing, and power envelope | Select when extending beyond 300 MHz LO or needing higher output power; redesign PCB and power delivery required |
| TRF3705IRGZT | Integrated fractional-N PLL, 50–4000 MHz LO range, 1.8 V core supply; lacks LP1/LP2 spurious tuning capability | Targeted at fully integrated transceivers; no external low-pass tuning for spur mitigation at low LO frequencies | Choose for simplified system integration with on-chip frequency synthesis; avoid if optimizing sub-100 MHz LO spurs is critical |
Compared with ADL5375-05ACPZ-R7 and TRF3705IRGZT, the U2793B-NFSG3H offers lower power (15 mA vs. >200 mA), dedicated spurious tuning (pins 19/20), and proven suitability for legacy digital radio standards-making it optimal for cost-sensitive, battery-powered, or narrowband RF designs where thermal and board space constraints dominate.
Availability
U2793B-NFSG3H is available at Aetrix Electronics and suitable for GSM handset design, WLAN up-converter development, JDC/PHS infrastructure, and DECT cordless system production requiring stable component supply and long-term lifecycle support.
Supply support for U2793B-NFSG3H includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Atmel Corporation (now part of Microchip Technology) is a semiconductor innovator specializing in microcontrollers, RF ICs, and mixed-signal solutions for communications and embedded systems.
The U2793B-NFSG3H belongs to Atmel's UHF RF front-end product line, engineered specifically for low-power, high-linearity quadrature modulation in digital cellular and wireless LAN transmitters.
FAQ
What is the recommended LO input level for U2793B-NFSG3H across its full 30–300 MHz range?
The U2793B-NFSG3H requires -15 dBm LO input at 150 MHz, scaling to -10 dBm at 30 MHz and -5 dBm at 300 MHz per Figure 6-4. This frequency-dependent level ensures optimal conversion gain and LO suppression. Operating outside these ranges risks degraded sideband suppression or increased noise floor. The LO input impedance is 50 Ω in series with 15 pF, so matching networks must account for capacitive reactance at higher frequencies. U2793B-NFSG3H datasheet Section 5.3.2 specifies these values under "LO Input Level".
Can U2793B-NFSG3H operate with DC-coupled baseband inputs, and what biasing is required?
Yes, U2793B-NFSG3H supports DC-coupled baseband inputs using the circuit in Figure 8-2. Pins 9–12 require a 2.5 V common-mode bias supplied via VREF (pin 13), which outputs a regulated 2.5 V ±125 mV. External resistors (R1 = 2.5 kΩ, R2 ≤ 10 kΩ) set the input offset to maintain ≥35 dB LO suppression. DC coupling eliminates AC-coupling capacitors but demands precise 2.5 V reference stability-U2793B-NFSG3H's internal VREF meets this with 30 Ω output impedance and <0.5 mV/°C drift.
How does the power-down mode function on U2793B-NFSG3H, and what is its settling time?
U2793B-NFSG3H enters power-down when PU (pin 1) is held ≤0.5 V, reducing supply current to 1 µA. Upon assertion of PU ≥4 V, the device achieves full RF output within 10 µs (tSPU), verified with CSPU = 100 pF and CRFo = 1 nF loads. This fast settling supports TDMA burst modes in GSM/DECT. The SPU pin (8) provides an additional timing reference for synchronization. U2793B-NFSG3H's power-down behavior is characterized in Section 5.2 of the datasheet.
What is the purpose of pins LP1 and LP2 (19 and 20) on U2793B-NFSG3H, and how are they used?
Pins LP1 and LP2 on U2793B-NFSG3H enable external tuning of output level and spurious performance-particularly effective below 100 MHz LO. A chip capacitor (1–10 pF) between LP1–LP2 improves low-frequency spur rejection, while adding a parallel resistor adjusts output level without degrading LO suppression or noise floor. This capability is unique to U2793B-NFSG3H among its class and is documented in Note 3 of Section 5. U2793B-NFSG3H's flexibility here avoids compromising I/Q drive level to meet spectral mask requirements.
Is U2793B-NFSG3H compatible with the U2795B mixer for 2 GHz up-conversion, and what interface considerations apply?
Yes, U2793B-NFSG3H is explicitly designed to interface with the U2795B mixer for up-conversion to 2 GHz, as stated in the device description. The U2793B-NFSG3H's RF output (pin 4) drives the U2795B's RF input directly via 50-Ω microstrip, requiring no DC blocking or level shifting. Both devices share compatible supply (5 V), ground structure (SSO20), and thermal profile (RthJA = 140 K/W). Layout best practices-such as minimizing stub length between RFO and U2795B input-ensure optimal isolation and noise performance in the combined up-converter chain.
U2793B-NFSG3H 19 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- U2793
- Package/Case:
- 20-LSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Modulator
- LO Frequency:
- 30MHz ~ 300MHz
- RF Frequency:
- -
- P1dB:
- -
- Noise Floor:
- -137dBm/Hz
- Output Power:
- 2dBm
- Current - Supply:
- 15 mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Test Frequency:
- 150MHz
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSO
U2793B-NFSG3H 19 FAQ
1.How can I place an order for U2793B-NFSG3H 19 through Aetrix?
Please submit a Request for Quotation (RFQ) for U2793B-NFSG3H 19 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for U2793B-NFSG3H 19 reliable?
The price and inventory of U2793B-NFSG3H 19 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for U2793B-NFSG3H 19 is usually 5 days.
3.What payment methods are accepted for U2793B-NFSG3H 19?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for U2793B-NFSG3H 19 transactions.
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4.How is shipping managed for U2793B-NFSG3H 19?
U2793B-NFSG3H 19 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your U2793B-NFSG3H 19 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for U2793B-NFSG3H 19?
For technical support, including U2793B-NFSG3H 19 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your U2793B-NFSG3H 19 requirements.
6.How does Aetrix verify that U2793B-NFSG3H 19 is sourced from the original manufacturer or authorized distributors?
All U2793B-NFSG3H 19 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that U2793B-NFSG3H 19 meets industry standards.
7.What is the process for return or replacement of U2793B-NFSG3H 19?
All U2793B-NFSG3H 19 units undergo pre-shipment inspection (PSI). If there is an issue with U2793B-NFSG3H 19, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The U2793B-NFSG3H 19 part is unused and in its original packaging.
Return procedure for U2793B-NFSG3H 19:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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